> For the complete documentation index, see [llms.txt](https://agpt.co/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://agpt.co/docs/integrations/block-integrations/text_overlay-1.md). # Video Text Overlay This block adds customizable text captions or titles to videos, with control over positioning, timing, and styling. ## Video Text Overlay ### What it is Add text overlay/caption to video ### How it works The block uses MoviePy's TextClip and CompositeVideoClip to render text onto video frames. The text is created as a separate clip with configurable font size, color, and optional background color, then composited over the video at the specified position. Timing can be controlled to show text only during specific portions of the video. Position options include center alignments (top, center, bottom) and corner positions (top-left, top-right, bottom-left, bottom-right). The output is encoded with H.264 video codec and AAC audio codec. ### Inputs | Input | Description | Type | Required | | ----------- | --------------------------------------------------- | --------------------------------------------------------------------------------------------- | -------- | | video\_in | Input video (URL, data URI, or local path) | str (file) | Yes | | text | Text to overlay on video | str | Yes | | position | Position of text on screen | "top" \| "center" \| "bottom" \| "top-left" \| "top-right" \| "bottom-left" \| "bottom-right" | No | | start\_time | When to show text (seconds). None = entire video | float | No | | end\_time | When to hide text (seconds). None = until end | float | No | | font\_size | Font size | int | No | | font\_color | Font color (hex or name) | str | No | | bg\_color | Background color behind text (None for transparent) | str | No | ### Outputs | Output | Description | Type | | ---------- | ------------------------------------------ | ---------- | | error | Error message if the operation failed | str | | video\_out | Video with text overlay (path or data URI) | str (file) | ### Possible use case * Adding titles or chapter headings to video content * Creating lower-thirds with speaker names or captions * Watermarking videos with branding text * Adding call-to-action text at specific moments in a video *** --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation by asking a question. Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters: ``` GET https://agpt.co/docs/integrations/block-integrations/text_overlay-1.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.